I had a nice 1991 Chevy Suburban some years back. I was cruising along a street in my town, when suddenly the engine made a racket and stopped. Tried to turn over, but very hard. Oh oh!
A friend came along and towed me home, a couple of miles out of town. Monday morning I called the GM dealer and described the problem. He said he would take a run out and have a look. He had me open the hood, took out his pocket knife and promptly cut the serpentine belt. "Okay, now start it." Took right off! The alternator bearing(s) had piled up.